DataGridView1.SelectedRows[0].Cells[0].Value is Null in the Following Code

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hope any can help in me this,
i have a datagridview and and tabcontrol,
tabcontrol has three tab pages,
tabPage_add,tabPage_edit and tabPage_view,
tabPage_add for adding the records,
tabPage_edit for editing and updating,
tabPage_view for Viewing,
in tabPage_view i have datagridview as 'dataGridView1'
i am bounding that gridView Data in a function called SetDataGridViewData()
i have added the Columns of dataGridView1 and have put their DisplayPropertyName to the Corresponding Columns of Database Table,
now
my need is that, if i want to edit the particular record in dataGridView1 then first the row of dataGridView1 must be selected and then can be navigated to tabPage_edit, the tabControl1_Selected Event Handler is like this

private void tabControl1_Selected(object sender, TabControlEventArgs e)
        {
            if (e.TabPage.Text.ToLower() == "add")
            {
                e.TabPage.Controls.Clear();
                setForAdd();
                e.TabPage.Controls.Add(tableLayoutPanel1);

            }
            else if (e.TabPage.Text.ToLower() == "edit")
            {
                e.TabPage.Controls.Clear();
                setForEdit();
                e.TabPage.Controls.Add(tableLayoutPanel1);
            }
            else
            {
                setDataGridViewData();
            }

        }

where setForEdit() is like this

void setForEdit()
        {
            if (dataGridView1.SelectedRows.Count > 0)
            {
                btn_add.Visible = false;
                btn_delete.Visible = true;
                btn_update.Visible = true;
                lbl_subhead.Text = "Edit Available Drug";

                setPanelById(dataGridView1.SelectedRows[0].Cells[0].Value.ToString());
            }// this line giving error as Object Reference is not set to the instance of Object
            else
                tabControl1.SelectedIndex = 2;
        }

the code for setForAdd() is like this

void setForAdd()
      {
          btn_add.Visible = true;
          btn_delete.Visible = false;
          btn_update.Visible = false;
          lbl_subhead.Text = "Add Available Drug";
          setEmptyScreenFields();
          setId();
      }

the code of dataGridView1 in the designer.cs is as

//
           // dataGridView1
           //
           this.dataGridView1.AllowUserToAddRows = false;
           this.dataGridView1.AllowUserToDeleteRows = false;
           this.dataGridView1.Anchor = System.Windows.Forms.AnchorStyles.Top;
           this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
           this.dataGridView1.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
           this.Column_id,
           this.Column_name,
           this.Column_type,
           this.Column_mnfrid,
           this.Column_expiryDate});
           this.dataGridView1.ContextMenuStrip = this.contextMenuStrip1;
           this.dataGridView1.Location = new System.Drawing.Point(150, 166);
           this.dataGridView1.Name = "dataGridView1";
           this.dataGridView1.ReadOnly = true;
           this.dataGridView1.Size = new System.Drawing.Size(627, 340);
           this.dataGridView1.TabIndex = 2;
           this.dataGridView1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.dataGridView1_MouseDown);

the remaining are doing exactly needed operations

thanx if somebody can help me.......

Posted 26-Jul-10 23:20pm

koool.kabeer

Updated 26-Jul-10 23:27pm

v3

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koool.kabeer · Answer 1 · 2010-07-27T00:55:00

sorry techies and expertises,
i was doing something wrong...
i had given the DataPropertyName of 'Column_mnfrId' as 'ad_mnfrId' but it is not the Column Name in DataBase Table... the Correct one is "ad_manufacturerId' ......
Due to this i was getting an extra Column in DataGridView which made the Index of DataGridViewColumn changed ...
totally i have 5 Columns but i was getting 6 Columns with one Starting Column as Null text( the Column whose DataPropertyName i gave incorrectly, thought this column was displaying at the Correct Index, but it was getting the Index of '0' at Runtime so i was getting the Error....

Column_mnfrId' Index i had given as '3' means fourth column..
even thought it was displaying at the fourth position , the value
that was returning by the line

dataGridView1.SelectedRows[0].Cells[0].Value.ToString()
was that Column Cell Value...(Null Value)...

But where as i had given the Column at Index '0' as another Column...

i would like to share something what i think is that....
when you give a wrong "DataProperyName" to a DataGridViewColumn then it will get the Index as '0' even though You assign your Columns in the Predefined Indices....

if somebody has any idea or some stuff to or share..... i would be glad..

i may be wrong but i would be happy if somebody corrects me...

thank you so much frnds......