Object reference not set to an instance of object

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protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        GridViewRow gr = GridView1.Rows[e.RowIndex] as GridViewRow;
        TextBox t1 = gr.FindControl("Empid") as TextBox;
        TextBox t2 = gr.FindControl("Name") as TextBox;
        TextBox t3 = gr.FindControl("Emailid") as TextBox;
        
        SqlConnection conn = new SqlConnection(@"Data Source=ARVIND-VAIO\ARVIND;Initial Catalog=ARVIND;Integrated Security=True");
        SqlCommand cmd = new SqlCommand("update Emp_info set Name='"+t2.Text+"',Emailid='"+t3.Text+"' where Empid='"+t1.Text+"'", conn);

        conn.Open();
        cmd.ExecuteNonQuery();
        conn.Close();
        display();
    }

public void display()
    {
        SqlConnection conn = new SqlConnection(@"Data Source=ARVIND-VAIO\ARVIND;Initial Catalog=ARVIND;Integrated Security=True");
        SqlCommand cmd = new SqlCommand("select * from Emp_info", conn);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds);
        GridView1.DataSource = ds;
        GridView1.DataBind();


    }

whats the error here?its saying Object reference not set to an instance of object in the sql command line..pls rectify the code and help

thanks in advance

Posted 11-May-13 19:53pm

Arvind Jha

Updated 11-May-13 20:03pm

Karthik. A

v4

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OriginalGriff · Answer 1 · 2013-05-11T20:05:00

As I told you when I answered this question yesterday:

Two problems here:
1) Either one of your names is wrong: "txtEmpid", "txtName", or "txtEmailid" is incorrect, or one of them is not a textbox. This means that the "tn" variable gets a null, so you get the error when you try to use it's Text property. Check the names and types.
 
2) Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead. This is particularly a problem with website code, where your database can be deleted from the other side of the world...

Please do not re-post the same question. Object reference not set to an instance of an object.[^]