Object reference not set to an instance of the Object

Question

Hi

In below code it gives error - TextBox txt = (TextBox)gr.Cells[gr.Cells.Count - 1].FindControl("txtDate");

In View PageSource it is showing something like this - <input name="grdPlanning$ctl108$ctl00" type="text" class="form-control" />

protected void lnkAdd_Click(object sender, EventArgs e)
{
    try
    {
        foreach (GridViewRow gr in grdPlanning.Rows)
        {
            if (gr.RowType == DataControlRowType.DataRow)
            {
                if (gr.Cells[0].Text == "146")
                {

                    TextBox txt = (TextBox)gr.Cells[gr.Cells.Count - 1].FindControl("txtDate");
                    string Ques = txt.Text;
                }
            }
        }
    }
}

protected void gr_RowDataBound(object sender, GridViewRowEventArgs e)
{
    try
    {
        if (e.Row.RowType != DataControlRowType.DataRow)
            return;
        e.Row.Cells[0].HorizontalAlign = HorizontalAlign.Center;

        TextBox txtDate = new TextBox();
        txtDate.CssClass = "form-control";
        txtDate.DataBind();
        e.Row.Cells[e.Row.Cells.Count - 1].Controls.Add(txtDate);
    }
}

Thanks

Ramco Ramco · Answer

Hi RajKiran If u see my Post i have created in GridView RowDataBound try { if (e.Row.RowType != DataControlRowType.DataRow) return; e.Row.Cells[0].HorizontalAlign = HorizontalAlign.Center; TextBox txtDate = new TextBox(); txtDate.CssClass = "form-control"; txtDate.DataBind(); e.Row.Cells[e.Row.Cells.Count - 1].Controls.Add(txtDate); } Thanks

Rajkiran Swain · Answer

It's possible that the code is returning null because the FindControl method is not finding the control with the ID "txtDate" in the GridView row. This could happen if the control is not being created or added to the row in the gr_RowDataBound method.

Ramco Ramco · Answer

Hi Rajkiran Why it is returning null . Is there anything wrong in my below code protected void gr_RowDataBound(object sender, GridViewRowEventArgs e) { try { if (e.Row.RowType != DataControlRowType.DataRow) return; e.Row.Cells[0].HorizontalAlign = HorizontalAlign.Center; TextBox txtDate = new TextBox(); txtDate.CssClass = "form-control"; txtDate.DataBind(); e.Row.Cells[e.Row.Cells.Count - 1].Controls.Add(txtDate); } } I want to access this Textbox Thanks

Rajkiran Swain · Answer

TextBox txt = gr.Cells[gr.Cells.Count - 1].FindControl("txtDate") as TextBox; if (txt != null) { string Ques = txt.Text; // Do something with Ques } The error "Object reference not set to an instance of the Object" occurs when you try to access a property or method of an object that is null or has not been instantiated. In this case, the error is likely being caused by the line TextBox txt = (TextBox)gr.Cells[gr.Cells.Count - 1].FindControl("txtDate"); where FindControl is returning null , so when you try to cast it to a TextBox , it throws the error. To fix this, you should first check if the control returned by FindControl is not null before trying to cast it to a TextBox . You can use the null-conditional operator ?. to perform this check in a concise way. Here's an example of how to do this: