I am binding different SqlDataSource (select statements and views) to GridView2 with button click methods. Each button loads the results of a different SQL statement into GridView2 and provides and row count...
I also have a button to export content loaded into GridView2 to CSV...
protected void ExportToCSV(object sender, EventArgs e)
{
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition","attachment;filename=GridExport.csv");
Response.Charset = "";
Response.ContentType = "application/text";
GridView2.AllowPaging = false;
GridView2.DataBind();
StringBuilder sb = new StringBuilder();
for (int k = 0; k < GridView2.Columns.Count; k++)
{
//add separator
sb.Append(GridView2.Columns[k].HeaderText + ',');
}
//append new line
sb.Append("\r\n");
for (int i = 0; i < GridView2.Rows.Count; i++)
{
for (int k = 0; k < GridView2.Columns.Count; k++)
{
//add separator
sb.Append(GridView2.Rows[i].Cells[k].Text + ',');
}
//append new line
sb.Append("\r\n");
}
Response.Output.Write(sb.ToString());
Response.Flush();
Response.End();
}
My issue is, the export only works correctly when I have only 1 of the Table_Click methods in my .cs file. IE, if I comment out all but 'protected void Table1_Click', the ExportToCSV works and the data is there in the spreadsheet. When I uncomment the rest,
the csv does export but it is empty.
I am confused about this because the databind works when I click each button. In my mind, the corresponding SqlDataSource will be bound GridView2 when I click the corresponding button, and then the ExportToCSV button should just export whatever is bound
a to GridView2 at that time...?
The goal (and I am so close!) is to be able to bind SQL data to GridView2 with a button A, export that data to CSV, and have the ability to then bind a different SqlDataSouce to the same GridView2 with button B, and export that data, etc.
Right now, the export button generates a csv download in the browser, but it is empty. Just a blank spreadsheet. If I comment out all but one of my Table_Click buttons, it works and the csv is populated.
Do you set AutoGenerateColumns to false in your gridview2 ? If you set it to true, the GridView2.Columns.Count in the ExportToCSV() is 0. That will cause the file is empty.
And please remove the GridView2.DataBind() in the ExportToCSV(), it will cause GridView2.Rows.Count in the ExportToCSV() to be 0.
protected void Table1_Click(object sender, EventArgs e)
{
GridView2.DataSource = SqlDataSource1;
GridView2.DataBind();
RowCount.Text = GridView2.Rows.Count.ToString();
}
protected void Table2_Click(object sender, EventArgs e)
{
GridView2.DataSource = SqlDataSource2;
GridView2.DataBind();
RowCount.Text = GridView2.Rows.Count.ToString();
}
protected void ExportToCSV(object sender, EventArgs e)
{
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment;filename=GridExport.csv");
Response.Charset = "";
Response.ContentType = "application/text";
GridView2.AllowPaging = false;
//GridView2.DataBind();
StringBuilder sb = new StringBuilder();
for (int k = 0; k < GridView2.Columns.Count; k++)
{
//add separator
sb.Append(GridView2.Columns[k].HeaderText + ',');
}
//append new line
sb.Append("\r\n");
for (int i = 0; i < GridView2.Rows.Count; i++)
{
for (int k = 0; k < GridView2.Columns.Count; k++)
{
//add separator
sb.Append(GridView2.Rows[i].Cells[k].Text + ',');
}
//append new line
sb.Append("\r\n");
}
Response.Output.Write(sb.ToString());
Response.Flush();
Response.End();
}
Best Regards
Cathy
MSDN Community Support
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...and that was it. I thought that because it worked when binding datasource directly to it, I did not need to add columns since I was binding the datasource with...
Member
1 Points
7 Posts
Binding to GridView onclick and export to csv
Feb 06, 2017 02:08 PM|m0lochwalker|LINK
Hello!
I am binding different SqlDataSource (select statements and views) to GridView2 with button click methods. Each button loads the results of a different SQL statement into GridView2 and provides and row count...
protected void Table1_Click(object sender, EventArgs e) { GridView2.DataSource = SqlDataSource1; GridView2.DataBind(); RowCount.Text = GridView2.Rows.Count.ToString(); } protected void Table2_Click(object sender, EventArgs e) { GridView2.DataSource = SqlDataSource2; GridView2.DataBind(); RowCount.Text = GridView2.Rows.Count.ToString(); } protected void Table3_Click(object sender, EventArgs e) { GridView2.DataSource = SqlDataSource3; GridView2.DataBind(); RowCount.Text = GridView2.Rows.Count.ToString(); } protected void Table4_Click(object sender, EventArgs e) { GridView2.DataSource = SqlDataSource4; GridView2.DataBind(); RowCount.Text = GridView2.Rows.Count.ToString(); }I also have a button to export content loaded into GridView2 to CSV...
protected void ExportToCSV(object sender, EventArgs e) { Response.Clear(); Response.Buffer = true; Response.AddHeader("content-disposition","attachment;filename=GridExport.csv"); Response.Charset = ""; Response.ContentType = "application/text"; GridView2.AllowPaging = false; GridView2.DataBind(); StringBuilder sb = new StringBuilder(); for (int k = 0; k < GridView2.Columns.Count; k++) { //add separator sb.Append(GridView2.Columns[k].HeaderText + ','); } //append new line sb.Append("\r\n"); for (int i = 0; i < GridView2.Rows.Count; i++) { for (int k = 0; k < GridView2.Columns.Count; k++) { //add separator sb.Append(GridView2.Rows[i].Cells[k].Text + ','); } //append new line sb.Append("\r\n"); } Response.Output.Write(sb.ToString()); Response.Flush(); Response.End(); }My issue is, the export only works correctly when I have only 1 of the Table_Click methods in my .cs file. IE, if I comment out all but 'protected void Table1_Click', the ExportToCSV works and the data is there in the spreadsheet. When I uncomment the rest, the csv does export but it is empty.
I am confused about this because the databind works when I click each button. In my mind, the corresponding SqlDataSource will be bound GridView2 when I click the corresponding button, and then the ExportToCSV button should just export whatever is bound a to GridView2 at that time...?
The goal (and I am so close!) is to be able to bind SQL data to GridView2 with a button A, export that data to CSV, and have the ability to then bind a different SqlDataSouce to the same GridView2 with button B, and export that data, etc.
Right now, the export button generates a csv download in the browser, but it is empty. Just a blank spreadsheet. If I comment out all but one of my Table_Click buttons, it works and the csv is populated.
Any advice is much appreciated. Thank you!
Star
8670 Points
2882 Posts
Re: Binding to GridView onclick and export to csv
Feb 07, 2017 06:42 AM|Cathy Zou|LINK
Hi m0lochwalker,
Could you show me your gridview2 ?
Do you set AutoGenerateColumns to false in your gridview2 ? If you set it to true, the GridView2.Columns.Count in the ExportToCSV() is 0. That will cause the file is empty.
And please remove the GridView2.DataBind() in the ExportToCSV(), it will cause GridView2.Rows.Count in the ExportToCSV() to be 0.
For example:
In aspx:
In behind code:
protected void Table1_Click(object sender, EventArgs e) { GridView2.DataSource = SqlDataSource1; GridView2.DataBind(); RowCount.Text = GridView2.Rows.Count.ToString(); } protected void Table2_Click(object sender, EventArgs e) { GridView2.DataSource = SqlDataSource2; GridView2.DataBind(); RowCount.Text = GridView2.Rows.Count.ToString(); } protected void ExportToCSV(object sender, EventArgs e) { Response.Clear(); Response.Buffer = true; Response.AddHeader("content-disposition", "attachment;filename=GridExport.csv"); Response.Charset = ""; Response.ContentType = "application/text"; GridView2.AllowPaging = false; //GridView2.DataBind(); StringBuilder sb = new StringBuilder(); for (int k = 0; k < GridView2.Columns.Count; k++) { //add separator sb.Append(GridView2.Columns[k].HeaderText + ','); } //append new line sb.Append("\r\n"); for (int i = 0; i < GridView2.Rows.Count; i++) { for (int k = 0; k < GridView2.Columns.Count; k++) { //add separator sb.Append(GridView2.Rows[i].Cells[k].Text + ','); } //append new line sb.Append("\r\n"); } Response.Output.Write(sb.ToString()); Response.Flush(); Response.End(); }Best Regards
Cathy
Please remember to click "Mark as Answer" the responses that resolved your issue.
If you have any compliments or complaints to MSDN Support, feel free to contact MSDNFSF@microsoft.com.
Member
1 Points
7 Posts
Re: Binding to GridView onclick and export to csv
Feb 07, 2017 01:30 PM|m0lochwalker|LINK
Hello Cathy!
Thank you! From your suggestions I see that I need to add columns to my GridView2. At the time I posted, it looked like this..
<asp:GridView ID="GridView2" runat="server" CssClass="Grid">
...and that was it. I thought that because it worked when binding datasource directly to it, I did not need to add columns since I was binding the datasource with...
protected void Table1_Click(object sender, EventArgs e) { GridView2.DataSource = SqlDataSource1; GridView2.DataBind(); RowCount.Text = GridView2.Rows.Count.ToString(); }I guess when I bind that way, I have to add BoundColumns to my gridview.
The BoundFields should get me going.
Thank you!!