[Solved] ASP.Net GridView Row Edit Error: Object reference not set to an instance of an object

indradeo

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User: indradeo
Posted: on Aug 11, 2021 12:25 AM
Forum: Data Controls
Answer: 1
Views: 3089
Sample Code: Download

Dear Sir,

Kindly check and help to remove mention error. While i have click on EDIT button , I have getting mention error. Please help me sir.

Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Source Error:

Line 114:                if (empId.Trim().ToLower() == Convert.ToString(Session["EmployeeID"]).Trim().ToLower())
Line 115:                {
Line 116:                    (e.Row.FindControl("btn_Edit") as Button).Visible = true;
Line 117:                }
Line 118:                else

Source File: c:\Users\Administrator\Documents\Visual Studio 2012\Projects\Cntrct_clsr\Cntrct_clsr\WebForm1.aspx.cs Line: 116 Stack Trace:

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4330.0

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        string empId = (e.Row.FindControl("hfEmployeeId") as HiddenField).Value;
        if (empId.Trim().ToLower() == Convert.ToString(Session["EmployeeID"]).Trim().ToLower())
        {
            (e.Row.FindControl("btn_Edit") as Button).Visible = true;
        }
        else
        {
            (e.Row.FindControl("btn_Edit") as Button).Visible = false;
        }
    }
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        string empId = (e.Row.FindControl("hfEmployeeId") as HiddenField).Value;
        if (empId.Trim().ToLower() == Convert.ToString(Session["EmployeeID"]).Trim().ToLower())
        {
            (e.Row.FindControl("btn_Closed") as Button).Visible = true;
        }
        else
        {
            (e.Row.FindControl("btn_Closed") as Button).Visible = false;
        }
    }
}

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dharmend...

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ANSWER
User: dharmendr
Replied: on Aug 11, 2021 06:47 AM
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indradeo says:
        protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

        {

            if (e.Row.RowType == DataControlRowType.DataRow)

            {

                string empId = (e.Row.FindControl("hfEmployeeId") as HiddenField).Value;

                if (empId.Trim().ToLower() == Convert.ToString(Session["EmployeeID"]).Trim().ToLower())

                {

                    (e.Row.FindControl("btn_Edit") as Button).Visible = true;

                }

                else

                {

                    (e.Row.FindControl("btn_Edit") as Button).Visible = false;

                }

            }

            if (e.Row.RowType == DataControlRowType.DataRow)

            {

                string empId = (e.Row.FindControl("hfEmployeeId") as HiddenField).Value;

                if (empId.Trim().ToLower() == Convert.ToString(Session["EmployeeID"]).Trim().ToLower())

                {

                    (e.Row.FindControl("btn_Closed") as Button).Visible = true;

                }

                else

                {

                    (e.Row.FindControl("btn_Closed") as Button).Visible = false;

                }

            }

        }

Replace above with below code.

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow && (e.Row.RowState & DataControlRowState.Edit) != DataControlRowState.Edit)
    {
        string empId = (e.Row.FindControl("hfEmployeeId") as HiddenField).Value;
        if (empId.Trim().ToLower() == Convert.ToString(Session["EmployeeID"]).Trim().ToLower())
        {
            (e.Row.FindControl("btn_Closed") as Button).Visible = true;
            (e.Row.FindControl("btn_Edit") as Button).Visible = true;
        }
        else
        {
            (e.Row.FindControl("btn_Closed") as Button).Visible = false;
            (e.Row.FindControl("btn_Edit") as Button).Visible = false;
        }
    }
}

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[Solved] ASP.Net GridView Row Edit Error: Object reference not set to an instance of an object

Dear Sir,

Kindly check and help to remove mention error. While i have click on EDIT button , I have getting mention error. Please help me sir.

Server Error in '/' Application.

Object reference not set to an instance of an object.

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