CODEWITHSUNDEEP
asp.net
William
William

Reputation: 330

Retrieving a Dynamically Generated TextBox Content in a GridView in ASP.NET

I have the following RowDataBound method for GridView2

protected void GridView2_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                List<TextBox> list = new List<TextBox>(); 
                if (ViewState["Table"] != null)
                    Assessments = (DataTable)ViewState["Table"]; 
                int count = 1;
                foreach (DataRow row in Assessments.Rows)
                {
                    TextBox txt = new TextBox();
                    txt.ID = "AsTxt"; 
                    txt.Text = string.Empty;
                    txt.TextChanged += OnTextChanged; 
                    e.Row.Cells[count].Controls.Add(txt);
                    count += 2;
                    listd.Add((e.Row.DataItem as DataRowView).Row[0].ToString() + "Txt");
                }
            }
        }

And the following event (Button Click) to retrieve whatever written in the text box in the GridView

protected void CalculateBtn_Click(object sender, EventArgs e)
        {
            GridViewRow rr = GridView2.Rows[0];
            TextBox rrrr = (rr.FindControl("AsTxt") as TextBox); 
            ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('" + rrrr.Text + "')", true);
        }

I always get NullReferenceException. That mean the TextBox object (rrrr) is null always. I am sure that the text object sits in GridView2.Rows[0].

Why is this happening?

Upvotes: 0

Views: 67

Answers (1)

Mahesh
Mahesh

Reputation: 8892

This is known issue with the Dynamical created controls in asp. So if you want to use the created control on your postback then I suggest that you declare your controls outside the page_int and do your initialization in the init then use them with their name instead of find control.

Look at this blog this might help you

http://techbrij.com/retrieve-value-of-dynamic-controls-in-asp-net

Upvotes: 1

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