Asp .Net GridView

Hi,

I have added one row dynamically below gridview header for inline search.I want to get value of these textbox on postback.

for dynamic row:

GridViewRow row = new GridViewRow(0,0, DataControlRowType.Header, DataControlRowState.Normal);

for (int i = 0; i < GridView1.Columns.Count; i++)

{

TableHeaderCell cell = new TableHeaderCell();

TextBox txtSearch = new TextBox();

txtSearch.Visible = true; txtSearch.Width = 140;

txtSearch.CssClass = "form-control";

txtSearch.ID = "txt1";

cell.Controls.Add(txtSearch);

row.Controls.Add(cell);

}

GridView1.HeaderRow.Parent.Controls.AddAt(1, row);

}

thanks

When using dynamic controls, you must remember that they will exist only until the next postback.ASP.NET will not re-create a dynamically added control. If you need to re-create a control multiple times, you should perform the control creation in the PageLoad event handler ( As currently you are just creating only for first time the TextBox using Condition: !IsPostabck ). This has the additional benefit of allowing you to use view state with your dynamic control. Even though view state is normally restored before the Page.Load event, if you create a control in the handler for the PageLoad event, ASP.NET will apply any view state information that it has after the PageLoad event handler ends.

So, Remove the Condition: !IsPostback, So that each time the page Loads, The TextBox control is also created. You will also see the State of Text box saved after PageLoad handler completes. [ Obviously you have not disabled ViewState!!! ]

Example:

protected void Page_Load(object sender, EventArgs e)
{
TextBox txtBox = new TextBox();
// Assign some text and an ID so you can retrieve it later.
txtBox.ID = "newButton";
PlaceHolder1.Controls.Add(txtBox);
}

Now after running it, type anything in text box and see what happens when you click any button that causes postback. The Text Box still has maintained its State!!!

For futher reference refer the following link : https://www.codeproject.com/Questions/330441/How-to-get-value-of-the-dynamically-created-contro

1 Reply

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Manikandan Murugesan9y ago
When using dynamic controls, you must remember that they will exist only until the next postback.ASP.NET will not re-create a dynamically added control. If you need to re-create a control multiple times, you should perform the control creation in the PageLoad event handler ( As currently you are just creating only for first time the TextBox using Condition: !IsPostabck ). This has the additional benefit of allowing you to use view state with your dynamic control. Even though view state is normally restored before the Page.Load event, if you create a control in the handler for the PageLoad event, ASP.NET will apply any view state information that it has after the PageLoad event handler ends.

So, Remove the Condition: !IsPostback, So that each time the page Loads, The TextBox control is also created. You will also see the State of Text box saved after PageLoad handler completes. [ Obviously you have not disabled ViewState!!! ]
Example:
protected void Page_Load(object sender, EventArgs e)
{

    TextBox txtBox = new TextBox();
    // Assign some text and an ID so you can retrieve it later.

    txtBox.ID = "newButton";
    PlaceHolder1.Controls.Add(txtBox);

}
Now after running it, type anything in text box and see what happens when you click any button that causes postback. The Text Box still has maintained its State!!!
For futher reference refer the following link : https://www.codeproject.com/Questions/330441/How-to-get-value-of-the-dynamically-created-contro