How to not add gridview last combobox value in Query

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C#

SQL

SQL-Server

WinForms

I have a grid view which include a row that contain
1. Combobox for column selection
2. Combobx for searching method (=, like, <, <>, >)
3. Text box for search (what to search)
4. Combobox for operator (AND/OR)

I am using this code to send where clause to Store procedure

private void buttonX1_Click(object sender, EventArgs e)
        {
            lblRecordNo.Text = "";

            foreach (DataGridViewRow Datarow in dataGridView1.Rows)
            {
                
                if (dataGridView1.RowCount == 1) //When DataGridview Contain only one row
                {
                    if (Datarow.Cells[0].Value != null && Datarow.Cells[1].Value != null && Datarow.Cells[2].Value != null)//&& Datarow.Cells[3].Value != null)
                    {

                        WhereClause += Datarow.Cells[0].Value.ToString() + "  " + Datarow.Cells[1].Value.ToString() + " " + Datarow.Cells[2].Value.ToString() + " ";
                        SearchQuery = WhereClause;    
                    }
                        
                    else
                    {
                        MessageBox.Show("Must Fill Column-کالم لازمی پر کریں","Error",MessageBoxButtons.OK,MessageBoxIcon.Information);
                    }
                    
                }
                else if (dataGridView1.RowCount > 1) //When DataGridview Contain MOre then 1 row
                {
                    if (Datarow.Cells[0].Value != null && Datarow.Cells[1].Value != null && Datarow.Cells[2].Value != null && Datarow.Cells[3].Value != null)
                    {
                       
                        WhereClause += Datarow.Cells[0].Value.ToString() + "  " + Datarow.Cells[1].Value.ToString() + " " + Datarow.Cells[2].Value.ToString()+ " " + Datarow.Cells[3].Value.ToString()+ " ";
                        SearchQuery =  WhereClause;
                    }
                        
                    else
                    {
                        MessageBox.Show("Must Fill Column-کالم لازمی پر کریں", "Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }    
                    
                }
                
            }

           
            //for testing search query ! What is this?
            MessageBox.Show(SearchQuery);
          

            //passing value to BLL CLass
            objSearching.WhereClause = SearchQuery;
            
            //pass Searched values to Form1 (Main Form) of Application.Bind also Search's tab Combobx and textboxes 
            //this work require to do!!!!!
            FrmMain.dgvhadiths.DataSource = objSearching.HadithSearching();
            
            dgvSearchHadith.DataSource = objSearching.HadithSearching();
            //reset the searching query variable
            lblRecordNo.Text = dgvSearchHadith.Rows.Count.ToString();
            WhereClause = ""; SearchQuery = ""; BookSelection="";
        }

This fine but the poblem if user add more then one row in Datagridview then how to not add

Datarow.Cells[3].Value.ToString()

this contain and/or keyword