CODEWITHSUNDEEP
c#asp.net
Yamen Massalha
Yamen Massalha

Reputation: 13

ASP.NET Getting value from gridview

Here is my code

protected void GridView1_DeletingRow(object sender, EventArgs e)
    {
        Functions con = new Functions();
        SqlConnection con1 = con.get();
        con1.Open();
        TextBox1.Visible = true;
        Button1.Visible = true;
        string z = TextBox1.Text;
        GridView1.EnableViewState = true;
        string name = GridView1.SelectedRow.Cells[1].Text;
        SqlCommand com3 = new SqlCommand("select id from products where product 
        = '" + name + "' ", con1);
        SqlDataReader read1 = com3.ExecuteReader();
        read1.Read();
        string pro = read1["id"].ToString();
        SqlCommand com = new SqlCommand("UPDATE CartItems SET quantity = '" + z 
        + "' where productid = '" + pro + "' ", con1);
    }

Error : 

Line 92:  string name = GridView1.SelectedRow.Cells[1].Text;

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

What is the error exactly? , and how can I fix it ?

Upvotes: 0

Views: 54

Answers (1)

Josh Darnell
Josh Darnell

Reputation: 11433

You should change your EventArgs parameter to the more-specific GridViewDeleteEventArgs type, and use that to find the row being deleted:

protected void GridView1_DeletingRow(object sender, GridViewDeleteEventArgs e)
{
    // ...your code
    string name = GridView1.Rows[e.RowIndex].Cells[1].Text;
    // ...the rest of your code

The most likely reason for your NullReferenceException is because the SelectedRow property is not set when the RowDeleting event is fired.

Note: it's also possible that "Cells[1].Text" could throw that exception, if your grid only has one column. You should review the advice in this post that can help you with debugging NullReferenceExceptions.

Upvotes: 1

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