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Function display char count

Posted By:      Posted Date: September 11, 2010    Points: 0   Category :.NET Framework
I want to know the meaning of function DisplayCharCount, span Counter ,documents.form[0],RegisterClientScriptBlock and Bolded line in the following programm and also let me know what is happening in this programm if(checkDisplayCount.Checked) {string scriptText="";scriptText+="function DisplayCharCount(){";scriptText+="spanCounter.innerText="+"document.forms[0].TextBox1.value.Length";scripttext+="}";ClientScript.RegisterClientScriptBlock(this.GetType(),"CounterScript",scriptText,true);TextBox1.Attributes.Add("onkeyup","DisplayCharCount()");LiteralControl("<span id=\"spanCounter\"></span>");PlaceHolder1.Controls.Add(spanLiteral);}}    

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