how to solve index was out of range. must be non-negative and less than the size of the collection?

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Hi,

Can anyone know this.

how to solve index was out of range. must be non-negative and less than the size of
the collection?

code is:

C#

protected void GridView1_RowUpdating1(object sender, GridViewUpdateEventArgs e)
   {
       int id = GridView1.EditIndex;
       GridViewRow rows = GridView1.Rows[e.RowIndex];
       int row = Convert.ToInt32(GridView1.DataKeys[id].Value.ToString());
       if (((TextBox)rows.FindControl("txtname") != null) && ((TextBox)rows.FindControl("txtaddress") != null))
       {
           TextBox txtname = (TextBox)rows.FindControl("txtname");
           TextBox txtaddress = (TextBox)rows.FindControl("txtaddress");
           con.Open();
           SqlCommand cmd = new SqlCommand("update employee set emp_name='" + txtname.Text + "',emp_address='" + txtaddr.Text + "' where emp_id='" + id + "", con);
           cmd.ExecuteNonQuery();
           GridView1.EditIndex = -1;
           con.Close();
           bind_grid();
       }
   }

Posted 19-Jul-12 22:06pm

sathiyak

Updated 20-Jul-12 5:09am

Wes Aday

v3

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Rajesh Buddaraju 20-Jul-12 14:31pm

This is a common issue. Debug the code then u will find it or let us know in which line u r getting this issue!

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OriginalGriff · Answer 1 · 2012-07-19T22:12:00

Without the actual code to work from, we can't be that precise.

But the error is pretty clear: You are accessing a collection of some form (list, array or other) using an index which is either negative, or larger than the index of the last value in the collection.

For example, if you have a list or an array that you are accessing in a loop, the loop counter must be less than the items count:

C#

for (int i = 0; i < myCollection.Length; i++)
   {
   Console.WriteLine(myCollection[i]);
   }

Will be fine, but

C#

for (int i = 1; i <= myCollection.Length; i++)
   {
   Console.WriteLine(myCollection[i]);
   }

Won't.

Mehdi Gholam · Answer 2 · 2012-07-19T22:12:00

Solution 2

You can check if your index is in the range :

C#

string[] arr = new string[3];
if(index < arr.Length) // check if in range
   string s = arr[index];

Posted 19-Jul-12 22:12pm

Mehdi Gholam

Nattudurai.E · Answer 3 · 2012-07-19T23:13:00

Solution 3

GridView1.DataKeys.exists(key)

Posted 19-Jul-12 23:13pm

Nattudurai.E

santosh pabba · Answer 4 · 2012-07-20T07:30:00

C#

int id = GridView1.EditIndex;

this might be the issue , and as per my knowledge,GridView1.EditIndex;can not be emp_id.

if GridView1.EditIndex return 1 or 2 , there is a possibility that you have datakey, but if you are editing some 20th row and you dont have 20 different datakeys types.

Try to use the code

C#

int row = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value);

to get your emp id.

Linto Leo Tom · Answer 5 · 2012-07-20T18:57:00

int row = Convert.ToInt32(GridView1.DataKeys[id].Value.ToString());
This line might be throwing the error.
Here id = GridView1.EditIndex, represets an index.
In (GridView1.DataKeys[id].Value.ToString(), you are trying get value from GridView1.DataKeys at index id. But there might not be any key for this index.

Check for that.

Happy Coding :)

how to solve index was out of range. must be non-negative and less than the size of the collection?

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